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Investigating the Effect Which Exercise Has On the Pulse Rate.

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Investigating the effect which exercise has on the pulse rate Introduction: The heart main job is to transport oxygen around the body. The cardiac cycle is the sequence of events during one complete cycle of a heartbeat. This consists of the simultaneous contraction of the two atria, a short pause, then the simultaneous contraction of the two ventricles, followed by a longer pause while the entire heart relaxes. The whole cycle is repeated about 70- 80 times per minute under resting conditions. When the atria contacts, the blood in them enters the two relaxing ventricles, completely filling them. The mitral and tricuspid valves, which were open, now begin to shut, and as they do so, they create vibrations in the heart walls and tendons, causing the first heart sound. The ventricles on contraction push open the pulmonary and aortic valves and eject blood in to he respective vesicles. The closed mitral and tricuspid valves prevent return of blood into the atria during this phrase. As the ventricles start to relax, the aortic and pulmonary valves close to prevent backward flow of blood, and their closure causes the second heart sound. By now, the atria have filled once again and are ready to start contracting to begin the next cardiac cycle. ...read more.


Safety: This is basically common sense. You have to be careful doing this experiment because you have to choose a floor surface, which you know you, won't slip over and hurt your head. Asthmatics also have to be careful whilst doing this experiment because it involves heart rate increasing dramatically. Also realistically you can't warm up because then your muscles would be used, so you have to be careful not to over exercise and pull muscles. Prediction and Scientific reason: I predict that the rate of respiration will increase as a result of exercise. I think that there will be a gradual increase to begin with, but as the body has to work harder I believe that the heart will increase at a faster rate. When the exercise is complete I think that the heart rate will gradually decrease back to the resting pulse rising. I also think that a lot of energy will be used up as the exercise takes place, thus resulting in further increase. If the body is unable to continue aerobic respiration, anaerobic respiration will take place. This results in lactic acid being formed. Finally, the CO2 levels would also rise which would also contribute tot he heart rate increasing. ...read more.


This could be because the person which did the exercise wasn't very fir, did not exercise a lot, or was either not feeling very well that day or wasn't happy about something so it made the heart rate a bit uneasy. Evaluation: I feel that my results, which I collected, were fairly accurate. I have already pointed out that the person who did the exercise wasn't fit because the first results were a bit high. This does effect my results but after resting results, the exercising results are fairly accurate. I can tell that m results are accurate because they follow a trend. That as exercise increase, so does the heart rate. I had to change my plan because originally I was going to run up and down five stairs but this couldn't be done because if I had fallen down the stairs or tripped. Surprisingly there were no results, which were not within the trend. If I could do the experiment again I would do the exercise times fore longer, so that I would be able to justice the maximum heart rate prediction which I have briefly mentioned. There are many ways in which I could change the investigation because I could change the independent variables, which I have already said. Overall I say that the experiment went as well as I expected. ?? ?? ?? ?? Kellie Atkins Biology sc2 Science investigation ...read more.

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